CN106882914B - Method for improving dehydration performance of excess sludge of municipal sewage treatment plant - Google Patents
Method for improving dehydration performance of excess sludge of municipal sewage treatment plant Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000018044 dehydration Effects 0.000 title claims abstract description 12
- 238000006297 dehydration reaction Methods 0.000 title claims abstract description 12
- 239000010865 sewage Substances 0.000 title claims abstract description 9
- 229910002971 CaTiO3 Inorganic materials 0.000 claims abstract description 6
- 230000005865 ionizing radiation Effects 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 3
- 230000000694 effects Effects 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 9
- 230000005855 radiation Effects 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 3
- 231100000987 absorbed dose Toxicity 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 10
- 239000002086 nanomaterial Substances 0.000 abstract description 7
- 230000005251 gamma ray Effects 0.000 abstract description 4
- 229920002521 macromolecule Polymers 0.000 abstract description 3
- 244000005700 microbiome Species 0.000 abstract description 3
- 238000006479 redox reaction Methods 0.000 abstract description 3
- 239000007790 solid phase Substances 0.000 abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 208000005156 Dehydration Diseases 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 6
- 239000011148 porous material Substances 0.000 description 4
- 238000011085 pressure filtration Methods 0.000 description 4
- 230000003197 catalytic effect Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000004062 sedimentation Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 239000010954 inorganic particle Substances 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 244000000010 microbial pathogen Species 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides a method for improving the dehydration performance of excess sludge of an urban sewage treatment plant, which adjusts the pH value of the excess sludge generated by the urban sewage treatment plant to 6.8-7.2, and adds CaTiO into the excess sludge3And then, ionizing radiation treatment is carried out on the mixture. The invention utilizes gamma ray to CaTiO3The irradiation of the nano material promotes the oxidation-reduction reaction, destroys the sludge floc structure, decomposes macromolecular substances in the sludge solid phase, leads to the death of microorganisms in the sludge, releases internal bound water and effectively improves the dehydration performance of the residual sludge.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a method for improving the dehydration performance of excess sludge of an urban sewage treatment plant.
Background
Excess sludge refers to activated sludge discharged from a secondary sedimentation tank (or a sedimentation zone) in an activated sludge system, is an extremely complex heterogeneous body composed of organic debris, bacterial cells, inorganic particles, colloids and the like, and needs to be properly disposed because the excess sludge contains a large amount of harmful substances such as pathogenic microorganisms, parasitic ova, heavy metals and the like, which greatly affect the environment. The main characteristics of the excess sludge are high water content which can reach more than 95%, high organic matter content, and difficult solid-liquid separation by sedimentation. Sludge dewatering is an extremely important link of the whole sludge treatment process, and aims to enrich solids, reduce sludge volume and create conditions for final treatment of sludge. The dehydration performance of the sludge directly affects the sludge treatment cost and the treatment effect, but the adoption of the more economic dehydration treatment mode can only reduce the water content of the dehydrated sludge cake of the sludge to 70-85 percent.
The gamma irradiation technology belongs to a new advanced oxidation technology, and has the characteristics of wide application range, high reaction speed, no secondary pollution and the like, so the gamma irradiation technology is widely concerned in the field of environment. The gamma irradiation technology utilizes the action of gamma rays and water to generate free radicals such as hydroxyl free radicals, hydrogen free radicals, hydrated electrons, peroxides and the like, and the free radicals have high activity and are easy to react with pollutants to decompose the pollutants, thereby achieving the effect of pollutant disposal.
The perovskite type composite oxide CaTiO3 is a novel inorganic non-metallic material with unique physical properties and chemical properties, and has good performances in the aspects of catalysis, storage, sensing, light absorption and the like. It has received extensive attention in the field of photocatalysis due to its unique electromagnetic properties and redox catalytic activity.
Disclosure of Invention
The invention provides a method for improving the dehydration performance of excess sludge of an urban sewage treatment plant in order to solve the problems of the prior art, and the method utilizes gamma rays to perform dehydration on CaTiO3The irradiation of the nano material promotes the oxidation-reduction reaction, destroys the sludge floc structure, decomposes macromolecular substances in the sludge solid phase, leads to the death of microorganisms in the sludge, releases internal bound water and effectively improves the dehydration performance of the residual sludge.
The method provided by the invention comprises the following steps: adjusting the pH value of the excess sludge generated by the municipal sewage treatment plant to 6.8-7.2, and adding 0.2g/l of CaTiO into the excess sludge3Then, ionizing radiation treatment is carried out on the mixture for 2-5 h.
The ionizing radiation adopts a gamma radiation source of Co-60 or Cs-137, the activity of the gamma radiation source is more than 10 ten thousand Curie, and the absorbed dose is more than 3 kGy.
The CaTiO3The material is solid powder with the diameter of 10 nm.
The invention has the beneficial effects that: because the gamma ray irradiation method for treating the excess sludge has the effect of improving the sludge dewatering performance to a certain extent,but its improvement effect is limited. In order to further improve the sludge dewatering performance, proper amount of CaTiO is added into the excess sludge while the excess sludge is irradiated by gamma rays3Nano material, using gamma ray to CaTiO3The irradiation of the nano material excites the catalytic activity of the nano material, the gamma ray has strong penetrating power, the catalytic activity of the nano material can be effectively improved, and the nano material has small specific surface area and is easy to disperse and contact with a target object, so that the oxidation-reduction reaction is promoted, the sludge floc structure is damaged, macromolecular substances in a sludge solid phase are decomposed, microorganisms in the sludge are killed, internal bound water is released, and the dehydration performance of the residual sludge is effectively improved.
Drawings
Fig. 1 is a graph showing a change tendency of specific resistance of sludge in example 1 (pH = 7.0).
Fig. 2 is a graph showing a change tendency of specific resistance of sludge in example 2 (pH = 10.0).
FIG. 3 is a graph showing the change tendency of specific resistance of sludge in example 3 (with CaTiO added)3Powder diameter 100 nm).
FIG. 4 is a graph showing the change tendency of specific resistance of sludge in example 4 (with CaTiO added)3The amount of powder was 0.05 g).
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Example 1:
(1) taking 1000mL of residual sludge sample, wherein the water content is 85 percent, and the sludge specific resistance is 5.864 multiplied by 1011m/kg, pH 6.7, with 1mol/L H2SO4The pH value of the solution is adjusted to 7.0 by 10g/L NaOH solution, 1000mL of sludge sample is subpackaged into 10 sealed sample bottles with the capacity of 100mL, and each bottle contains 100mL of sludge sample. 10 volumetric flasks filled with sludge samples are divided into a 1 st group and a 2 nd group, wherein each group comprises 5 volumetric flasks, the 5 volumetric flasks in the 1 st group are respectively numbered as 1-1,1-2,1-3,1-4 and 1-5, and the 5 volumetric flasks in the 2 nd group are respectively numbered as 2-1,2-2,2-3,2-4 and 2-5.
(2) Respectively adding 0.02g of CaTiO with the diameter of 10nm into sample bottles No. 1-1,1-2,1-3,1-4 and 1-5 of group 13Powder and shake up by hand.
(3) Placing the group 1 sample and the group 2 sample in a gamma irradiation central pore channel for irradiation treatment, wherein the irradiation time of a No. 1 volumetric flask and a No. 2 volumetric flask is 2 hours, the irradiation time of a No. 1 volumetric flask, a No. 2 volumetric flask and a No. 2 volumetric flask is 4 hours, the irradiation time of a No. 1 volumetric flask, a No. 3 volumetric flask and a No. 2 volumetric flask is 6 hours, the irradiation time of a No. 1 volumetric flask, a No. 4 volumetric flask and a No. 2 volumetric flask is 8 hours, the irradiation time of a No. 1 volumetric flask, a No. 5 volumetric flask and a No. 2 volumetric flask is 10 hours, a radiation source is Co-60, the activity is 30 kilo Curie, and the absorption dose rate in the.
(4) And respectively measuring the specific resistance of the sludge in the 1 st group volumetric flask and the 2 nd group volumetric flask after irradiation by using a constant pressure filtration method. The smaller the specific resistance of the sludge, the better the sludge dewatering performance.
(5) The measurement results are shown in FIG. 1.
Example 2:
(1) taking 1000mL of residual sludge sample, wherein the water content is 85 percent, and the sludge specific resistance is 5.864 multiplied by 1011m/kg, pH 6.7, with 1mol/L H2SO4The pH value of the solution is adjusted to 10.0 by 10g/L NaOH solution, 1000mL of sludge sample is subpackaged into 10 sealed sample bottles with the capacity of 100mL, and each sealed sample bottle contains 100mL of sludge sample. 10 volumetric flasks filled with sludge samples are divided into a 1 st group and a 2 nd group, wherein each group comprises 5 volumetric flasks, the 5 volumetric flasks in the 1 st group are respectively numbered as 1-1,1-2,1-3,1-4 and 1-5, and the 5 volumetric flasks in the 2 nd group are respectively numbered as 2-1,2-2,2-3,2-4 and 2-5.
(2) Respectively adding 0.02g of CaTiO with the diameter of 10nm into sample bottles No. 1-1,1-2,1-3,1-4 and 1-5 of group 13Powder and shake up by hand.
(3) Placing the group 1 sample and the group 2 sample in a gamma irradiation central pore channel for irradiation treatment, wherein the irradiation time of a No. 1 volumetric flask and a No. 2 volumetric flask is 2 hours, the irradiation time of a No. 1 volumetric flask, a No. 2 volumetric flask and a No. 2 volumetric flask is 4 hours, the irradiation time of a No. 1 volumetric flask, a No. 3 volumetric flask and a No. 2 volumetric flask is 6 hours, the irradiation time of a No. 1 volumetric flask, a No. 4 volumetric flask and a No. 2 volumetric flask is 8 hours, the irradiation time of a No. 1 volumetric flask, a No. 5 volumetric flask and a No. 2 volumetric flask is 10 hours, a radiation source is Co-60, the activity is 30 kilo Curie, and the absorption dose rate in the.
(4) And respectively measuring the specific resistance of the sludge in the 1 st group volumetric flask and the 2 nd group volumetric flask after irradiation by using a constant pressure filtration method. The smaller the specific resistance of the sludge, the better the sludge dewatering performance.
(5) As shown in FIG. 2, the specific resistance of the sludge was higher than that in example 1 at the same irradiation dose, indicating that the sludge dewatering performance was inferior to that in example 1 after the pH of the sludge was adjusted to 10 in example 2.
Example 3:
(1) taking 1000mL of residual sludge sample, wherein the water content is 85 percent, and the sludge specific resistance is 5.864 multiplied by 1011m/kg, pH 6.7, with 1mol/L H2SO4The pH value of the solution is adjusted to 7.0 by 10g/L NaOH solution, 1000mL of sludge sample is subpackaged into 10 sealed sample bottles with the capacity of 100mL, and each bottle contains 100mL of sludge sample. 10 volumetric flasks filled with sludge samples are divided into a 1 st group and a 2 nd group, wherein each group comprises 5 volumetric flasks, the 5 volumetric flasks in the 1 st group are respectively numbered as 1-1,1-2,1-3,1-4 and 1-5, and the 5 volumetric flasks in the 2 nd group are respectively numbered as 2-1,2-2,2-3,2-4 and 2-5.
(2) Respectively adding 0.02g of CaTiO with the diameter of 100nm into sample bottles No. 1-1,1-2,1-3,1-4 and 1-5 of group 13Powder and shake up by hand.
(3) Placing the group 1 sample and the group 2 sample in a gamma irradiation central pore channel for irradiation treatment, wherein the irradiation time of a No. 1 volumetric flask and a No. 2 volumetric flask is 2 hours, the irradiation time of a No. 1 volumetric flask, a No. 2 volumetric flask and a No. 2 volumetric flask is 4 hours, the irradiation time of a No. 1 volumetric flask, a No. 3 volumetric flask and a No. 2 volumetric flask is 6 hours, the irradiation time of a No. 1 volumetric flask, a No. 4 volumetric flask and a No. 2 volumetric flask is 8 hours, the irradiation time of a No. 1 volumetric flask, a No. 5 volumetric flask and a No. 2 volumetric flask is 10 hours, a radiation source is Co-60, the activity is 30 kilo Curie, and the absorption dose rate in the.
(4) And respectively measuring the specific resistance of the sludge in the 1 st group volumetric flask and the 2 nd group volumetric flask after irradiation by using a constant pressure filtration method. The smaller the specific resistance of the sludge, the better the sludge dewatering performance.
(5) The measurement results are shown in FIG. 3, and compared with example 1, the specific resistance of the sludge is higher under the same irradiation absorption dose, which shows that CaTiO to be added in example 33The sludge dewatering performance after changing the diameter of the powder from 10nm to 100nm was inferior to that of example 1.
Example 4:
(1) taking 1000mL of residual sludge sample, wherein the water content is 85 percentThe specific resistance of the sludge is 5.864 multiplied by 1011m/kg, pH 6.7, with 1mol/L H2SO4The pH value of the solution is adjusted to 7.0 by 10g/L NaOH solution, 1000mL of sludge sample is subpackaged into 10 sealed sample bottles with the capacity of 100mL, and each bottle contains 100mL of sludge sample. 10 volumetric flasks filled with sludge samples are divided into a 1 st group and a 2 nd group, wherein each group comprises 5 volumetric flasks, the 5 volumetric flasks in the 1 st group are respectively numbered as 1-1,1-2,1-3,1-4 and 1-5, and the 5 volumetric flasks in the 2 nd group are respectively numbered as 2-1,2-2,2-3,2-4 and 2-5.
(2) Respectively adding 0.05g of CaTiO with the diameter of 10nm into sample bottles No. 1-1,1-2,1-3,1-4 and 1-5 of group 13Powder and shake up by hand.
(3) Placing the group 1 sample and the group 2 sample in a gamma irradiation central pore channel for irradiation treatment, wherein the irradiation time of a No. 1 volumetric flask and a No. 2 volumetric flask is 2 hours, the irradiation time of a No. 1 volumetric flask, a No. 2 volumetric flask and a No. 2 volumetric flask is 4 hours, the irradiation time of a No. 1 volumetric flask, a No. 3 volumetric flask and a No. 2 volumetric flask is 6 hours, the irradiation time of a No. 1 volumetric flask, a No. 4 volumetric flask and a No. 2 volumetric flask is 8 hours, the irradiation time of a No. 1 volumetric flask, a No. 5 volumetric flask and a No. 2 volumetric flask is 10 hours, a radiation source is Co-60, the activity is 30 kilo Curie, and the absorption dose rate in the.
(4) And respectively measuring the specific resistance of the sludge in the 1 st group volumetric flask and the 2 nd group volumetric flask after irradiation by using a constant pressure filtration method. The smaller the specific resistance of the sludge, the better the sludge dewatering performance.
(5) The measurement results are shown in FIG. 4, compared with example 1, the specific resistance of the sludge is lower under the same irradiation absorption dose, but no obvious gain effect is obtained, which shows that CaTiO is used in example 43The addition amount of the sludge additive is increased from 0.02g to 0.05g, and the sludge dewatering performance is not obviously improved.
While the invention has been described in terms of its preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (2)
1. A method for improving the dehydration performance of excess sludge of an urban sewage treatment plant is characterized by comprising the following steps: treating urban sewageAdjusting pH value of excess sludge generated by treatment plant to 6.8-7.2, and adding 0.2g/L CaTiO into the excess sludge3Then, ionizing radiation treatment is carried out on the mixture for 2-5 h; the ionizing radiation adopts a gamma radiation source of Co-60 or Cs-137, the activity of the gamma radiation source is more than 10 ten thousand Curie, and the absorbed dose is more than 3 kGy.
2. The method for improving the dewatering performance of the excess sludge of the municipal sewage treatment plant according to claim 1, wherein: the CaTiO3The material is solid powder with the diameter of 10 nm.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102513108A (en) * | 2011-12-07 | 2012-06-27 | 江苏兆盛环保集团有限公司 | TiO2-carrying photoelectric catalyst for photoelectrocatalytic advanced treatment on sludge and method and device for TiO2-carrying photoelectric catalyst-based photoelectrocatalytic advanced treatment on sludge |
| CN102976583A (en) * | 2012-12-28 | 2013-03-20 | 江苏兆盛环保集团有限公司 | Deep dehydration treatment method for sludge of river courses and enclosed lakes |
| CN105217905A (en) * | 2015-09-30 | 2016-01-06 | 王立鹏 | The combined modified flyash of gamma-rays cracks the method for excess sludge |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102513108A (en) * | 2011-12-07 | 2012-06-27 | 江苏兆盛环保集团有限公司 | TiO2-carrying photoelectric catalyst for photoelectrocatalytic advanced treatment on sludge and method and device for TiO2-carrying photoelectric catalyst-based photoelectrocatalytic advanced treatment on sludge |
| CN102976583A (en) * | 2012-12-28 | 2013-03-20 | 江苏兆盛环保集团有限公司 | Deep dehydration treatment method for sludge of river courses and enclosed lakes |
| CN105217905A (en) * | 2015-09-30 | 2016-01-06 | 王立鹏 | The combined modified flyash of gamma-rays cracks the method for excess sludge |
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| Title |
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| 《A polyacrylamide gel route to different-sized CaTiO3 nanoparticles and their photocatalytic activity for dye degradation》;Y.S.Huo 等;《J. Sol-Gel Sci. Technol.》;20140427;全文 * |
| 《γ-射线辐照法处理剩余活性污泥的试验研究》;吴宇琦 等;《南华大学学报（自然科学版）》;20150930;第29卷(第3期);第112页第1.1-1.3节、表1，第115页第3节 * |
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